<template>
    <div>
      <!-- 面包屑但行列-->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>

      <!-- 添加商品卡片-->
      <el-card>
        <!-- 提示区域-->
        <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>

        <!-- 步骤区域进度条-->
        <el-steps align-center :space="200" :active="activeIndex - 0" finish-status="success">
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>

        <!-- tab栏区域-->
        <el-form label-position="top" :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
          <el-tabs @tab-click="tabClicked" v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave">
            <el-tab-pane label="基本信息" name="0">
              <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
              </el-form-item>
              <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品分类" prop="">
                <el-cascader v-model="addForm.goods_cat" :options="options" :props="guize" @change="changeHandle"></el-cascader>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
              <!-- 板式渲染 -->
              <el-form-item :label="item.attr_name" v-for="item in manyTabData" :key="item.attr_id">
                <!-- 复选框渲染 -->
                <el-checkbox-group v-model="item.attr_vals">
                  <el-checkbox border :label="cd" v-for="(cd, i) in item.attr_vals" :key="i"></el-checkbox>
                </el-checkbox-group>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
              <!--渲染模板-->
              <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
                <el-input v-model="item.attr_vals"></el-input>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
              <!-- 图片上传 action 表示图片要上传到的后台API地址 on-preview:点击图片触发事件-->
              <el-upload :on-success="handleSuccess" :headers="headerObj" :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture">
                <el-button size="small" type="primary">点击上传</el-button>
                <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
              </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
              <!-- 富文本编辑器组件-->
              <quill-editor v-model="addForm.goods_introduce"></quill-editor>
              <!-- 添加商品按钮-->
              <el-button type="primary" @click="add">添加商品</el-button>
            </el-tab-pane>
          </el-tabs>
        </el-form>
      </el-card>
      <!-- 图片预览 -->
      <el-dialog title="图片预览" :visible.sync="picVisible" width="50%">
        <img :src="previewPath" width="100%">
      </el-dialog>
    </div>
</template>

<script>
import _ from 'loadsh'
export default {
  data() {
    return {
      // 步骤进条数
      activeIndex: '0',
      // 添加表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片上传数组
        pics: [],
        // 商品详情描述
        goods_introduce: '',
        attrs: []
      },
      // 表单数据验证规则
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请选择商品分类', trigger: 'blur' }]
      },
      // 获取数据分类列表
      options: [],
      // 联级选择规则
      guize: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数值
      manyTabData: [],
      //
      checkValue: [],
      // 静态属性
      onlyTabData: [],
      // 上传图片的地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 图片地址
      previewPath: '',
      picVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品数据
    async getCateList() {
      const { data: result } = await this.$http.get('categories')
      this.options = result.data
    },
    // 监听联级选择框的变化
    changeHandle() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
        this.$message.error('只允许选择三级分类')
      }
    },
    // Tab 离开触发事件
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类')
        return false
      }
    },
    // 切换tab导航
    async tabClicked() {
      // 证明访问的是动态参数面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) return this.$message.error('获取动态参数失败')
        res.data.forEach(item => {
          if (item.attr_vals.length === 0) {
            item.attr_vals = []
          } else {
            item.attr_vals = item.attr_vals.split(' ')
          }
        })
        this.manyTabData = res.data
      } else if (this.activeIndex === '2') {
        const { data: result } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (result.meta.status !== 200) return this.$message.error('获取静态属性失败')
        this.onlyTabData = result.data
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url
      this.picVisible = true
    },
    // 处理删除图片事件
    handleRemove(file) {
      // 1.获取将删除图片的临时路径
      const filePath = file.response.data.tmp_path
      let indexInfo = 0
      console.log(filePath)
      // 2.从pics数组中，找到这个图片的索引值
      this.addForm.pics.findIndex((item, index) => {
        if (item.pic === filePath) {
          indexInfo = index
        }
      })
      // 3.调用数组的splice方法，把图片信息对象删除
      this.addForm.pics.splice(indexInfo, 1)
    },
    // 图片上传成功处理
    handleSuccess(response) {
      // 1. 拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2. 将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo)
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async vaild => {
        if (!vaild) return this.$message.error('请填写表单必填项！')

        // 执行添加业务逻辑
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTabData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTabData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs

        // 发起请求添加商品
        // 商品的名称，必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        console.log(res)
        if (res.meta.status !== 201) return this.$message.error('添加失败')
        this.$message.success('添加成功')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style scoped>
.el-steps {
  margin-top: 15px;
  margin-bottom: 10px;
}
.el-step__title {
  font-size: 13px;
}
.el-checkbox {
  margin: 0;
}
.quill-editor {
  margin-bottom: 10px;
}
</style>
